/**
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.workgroup.packet;

import org.jivesoftware.smackx.workgroup.QueueUser;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.xmlpull.v1.XmlPullParser;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * Queue details packet extension, which contains details about the users
 * currently in a queue.
 */
public class QueueDetails implements PacketExtension {

	/**
	 * Element name of the packet extension.
	 */
	public static final String ELEMENT_NAME = "notify-queue-details";

	/**
	 * Namespace of the packet extension.
	 */
	public static final String NAMESPACE = "http://jabber.org/protocol/workgroup";

	private static final String DATE_FORMAT = "yyyyMMdd'T'HH:mm:ss";

	private SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
	/**
	 * The list of users in the queue.
	 */
	private Set<QueueUser> users;

	/**
	 * Creates a new QueueDetails packet
	 */
	private QueueDetails() {
		users = new HashSet<QueueUser>();
	}

	/**
	 * Returns the number of users currently in the queue that are waiting to be
	 * routed to an agent.
	 * 
	 * @return the number of users in the queue.
	 */
	public int getUserCount() {
		return users.size();
	}

	/**
	 * Returns the set of users in the queue that are waiting to be routed to an
	 * agent (as QueueUser objects).
	 * 
	 * @return a Set for the users waiting in a queue.
	 */
	public Set<QueueUser> getUsers() {
		synchronized (users) {
			return users;
		}
	}

	/**
	 * Adds a user to the packet.
	 * 
	 * @param user
	 *            the user.
	 */
	private void addUser(QueueUser user) {
		synchronized (users) {
			users.add(user);
		}
	}

	public String getElementName() {
		return ELEMENT_NAME;
	}

	public String getNamespace() {
		return NAMESPACE;
	}

	public String toXML() {
		StringBuilder buf = new StringBuilder();
		buf.append("<").append(ELEMENT_NAME).append(" xmlns=\"")
				.append(NAMESPACE).append("\">");

		synchronized (users) {
			for (Iterator<QueueUser> i = users.iterator(); i.hasNext();) {
				QueueUser user = (QueueUser) i.next();
				int position = user.getQueuePosition();
				int timeRemaining = user.getEstimatedRemainingTime();
				Date timestamp = user.getQueueJoinTimestamp();

				buf.append("<user jid=\"").append(user.getUserID())
						.append("\">");

				if (position != -1) {
					buf.append("<position>").append(position)
							.append("</position>");
				}

				if (timeRemaining != -1) {
					buf.append("<time>").append(timeRemaining)
							.append("</time>");
				}

				if (timestamp != null) {
					buf.append("<join-time>");
					buf.append(dateFormat.format(timestamp));
					buf.append("</join-time>");
				}

				buf.append("</user>");
			}
		}
		buf.append("</").append(ELEMENT_NAME).append(">");
		return buf.toString();
	}

	/**
	 * Provider class for QueueDetails packet extensions.
	 */
	public static class Provider implements PacketExtensionProvider {

		public PacketExtension parseExtension(XmlPullParser parser)
				throws Exception {

			SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
			QueueDetails queueDetails = new QueueDetails();

			int eventType = parser.getEventType();
			while (eventType != XmlPullParser.END_TAG
					&& "notify-queue-details".equals(parser.getName())) {
				eventType = parser.next();
				while ((eventType == XmlPullParser.START_TAG)
						&& "user".equals(parser.getName())) {
					String uid = null;
					int position = -1;
					int time = -1;
					Date joinTime = null;

					uid = parser.getAttributeValue("", "jid");

					if (uid == null) {
						// throw exception
					}

					eventType = parser.next();
					while ((eventType != XmlPullParser.END_TAG)
							|| (!"user".equals(parser.getName()))) {
						if ("position".equals(parser.getName())) {
							position = Integer.parseInt(parser.nextText());
						} else if ("time".equals(parser.getName())) {
							time = Integer.parseInt(parser.nextText());
						} else if ("join-time".equals(parser.getName())) {
							joinTime = dateFormat.parse(parser.nextText());
						} else if (parser.getName().equals("waitTime")) {
							Date wait = dateFormat.parse(parser.nextText());
							System.out.println(wait);
						}

						eventType = parser.next();

						if (eventType != XmlPullParser.END_TAG) {
							// throw exception
						}
					}

					queueDetails.addUser(new QueueUser(uid, position, time,
							joinTime));

					eventType = parser.next();
				}
			}
			return queueDetails;
		}
	}
}